Sony projectors use either Sony15 IR protocol, device 84, or for a few other functions, Sony20, device 26.42.  The RM-VLZ620 is made by UEI, and the UEI code that should work is 00353.  However, I don't think your remote has that code.

Other remotes made by UEI do have setup codes which can be manually programmed to send the correct signals, but Sony has their own spin, and the RM-VLZ620 isn't manually programmable.

If you have a Comcast remote, Atlas remote provided by other cable companies, or are willing to buy a RCA RCRP05B for $20 (or a number of AllForOne remotes) then we can tell you how to enter 5 digit EFCs to assign a function to a button.